For a mattress to be able to cool a hot sleeper down it must have a couple of elements to be able to do that. It has to be made of a material that will disperse the heat leaving the customer cool while they sleep at night and it must have a good air flow system to allow air to shoot through the mattress to help keep it cool. If it has gel foam this would be a very good benefit because the gel foam is able to keep the customer cool while they sleep. These types of mattresses could be very expensive in relation to regular mattresses. The question is do you want to spend a few thousand dollars for a cooling mattress with the best cooling technology? There are some mattresses with cooling technology but they are not cheap. You should probably expect to pay a fair amount of money for a mattress made with the latest cooling technology but they should last a long time because they are so expensive. These are mattresses that will help to keep sleepers who overheat during the night. It must keep the customer cool and feeling comfortable in the evening. If the mattress does not keep the sweat off the body then the cooling mattress is not serving its purpose.